Ok, cheers for the input

I work a mix of earlies/lates/nights, i workout before nightshift and lateshift but after early shift, the problem im having is by the time i've done my early shift i want to go to the gym but have a bit of a lethargic feeling, even though i've ate/drank well (3 meals before the gym), had a decent sleep the night before (6-8hrs) etc... a little boost would be nice and beneficial.

I'm also considering maltodextrin as an extra source of carbs throughout the day just in case im not getting enough calories into myself.

edited to say im also having multivitamins morning and night as well as codliver oil/omega 3 capsules with a couple of meals throughout the day.